PLEASE HELP!! DNA mutations and cancer activity

Answer:
nosexd
xdxdxdxdxxdxdxdxdxdxdxxdxdxdxdxdxdxdxdxdxxddxdxdxdxdxdddxdxddxdxdxdxdxxxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxxd
xd
dx
dx
dxd
X
dx
xdxdddxxxddxdxdx
Explanation: